This replaces instances of `assertSame( [number], count( ... ) )` with `assertCount()` to use native PHPUnit functionality. Follow-up to [51335], [51337]. See #53363. Built from https://develop.svn.wordpress.org/trunk@51367 git-svn-id: http://core.svn.wordpress.org/trunk@50978 1a063a9b-81f0-0310-95a4-ce76da25c4cd